CN111401345B - DSM automatic comparison system based on aerial photography measurement - Google Patents
DSM automatic comparison system based on aerial photography measurement Download PDFInfo
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Abstract
The invention discloses a DSM automatic comparison system based on aerial photography measurement, belonging to the technical field of aerial photography measurement, the system comprises an elevation extraction module, an elevation conversion module, a layer superposition module and a comparison and labeling module, wherein the elevation extraction module is used for extracting elevation data of two-stage sailing pieces processed by a sailing piece processing module, the elevation conversion module is used for converting the elevation data of the two-stage sailing pieces extracted by the elevation extraction module into a vector layer, the map layer overlapping module is used for overlapping the vector map layers of the two-stage aerial photographs, and the comparison marking module is used for marking the changed areas in the vector map layers of the two-stage aerial photographs.
Description
Technical Field
The invention relates to the technical field of aerial photography measurement, in particular to a DSM automatic comparison system based on aerial photography measurement.
Background
The aerial photography measurement means that an unmanned aerial vehicle and an aerial photography camera are used for carrying out aerial photography on a certain area, the buildings in the area are counted and known through aerial photography aerial films, the aerial photography aerial films are compared with the aerial films corresponding to the area in the current period, the illegal buildings in the area can be confirmed, and whether the illegal use condition of the national land occurs or not can be clearly known;
the inspection comparison mainly uses two-stage orthographic aerial photographs at present, behaviors such as illegal construction and the like are found through manual identification, and due to the limitation of the manual identification, the inspection comparison result has the following defects:
1. the efficiency is low, and the manual identification efficiency is low for the inspection comparison with a large range;
2. the omission is large, and small and unobvious illegal buildings can be easily omitted through manual comparison;
3. the quality requirement on the ortho-image is high, and the inspection and comparison can be carried out only by a clear ortho-image;
therefore, there is a need for an automatic DSM matching system based on aerial measurements to solve the above problems.
Disclosure of Invention
The invention aims to provide an automatic DSM comparison system based on aerial photography measurement to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a DSM automatic comparison system based on aerial photography measurement comprises a aerial photo processing module, an elevation extraction module, an elevation conversion module, a layer superposition module and a comparison and labeling module;
the aerial photo processing module is used for shooting, orthographically and cutting aerial photos, comparing and labeling the aerial photos by using an automatic comparison system in the later period of convenience, the elevation extraction module is used for extracting elevation data of two-period aerial photos after the aerial photo processing module processes, the elevation conversion module is used for converting the elevation data of the two-period aerial photos extracted by the elevation extraction module into vector image layers, the elevation data of the two-period ortho aerial photos are converted into the vector image layers through the elevation extraction module and the elevation conversion module, automatic comparison is carried out on the vector image layers, the comparison efficiency and the comparison precision are improved, the image layer superposition module is used for carrying out superposition processing on the vector image layers of the two-period aerial photos, fixed-point comparison of the two-period aerial photos is facilitated, the comparison accuracy is improved, the comparison and labeling module is used for labeling changed areas in the two-period aerial photo vector image layers, so that automatic labeling can be realized and the comparison efficiency is improved;
the output of aerial photo processing module is connected with the input of elevation extraction module, the output of elevation extraction module is connected with the input of elevation conversion module, the input of picture layer stack module is connected to the output of elevation conversion module, the input of comparison mark module is connected to the output of picture layer stack module.
The two-stage aerial photos refer to historical aerial photos after orthographic processing and original aerial photos currently shot by the unmanned aerial vehicle.
According to the technical scheme, the aerial photo processing module comprises an aerial photo shooting unit, an aerial photo orthographic unit and an aerial photo cutting unit;
the two-phase orthographic photo is convenient to compare with the orthographic photo in the previous phase, the orthographic photo cutting unit utilizes the ARCGIS to cut the orthographic photo after the orthographic processing and the orthographic photo in the previous phase, the ARCGIS provides a telescopic and comprehensive geographic information system platform for users, the platform comprises a plurality of programmable components, the related area of the objects from fine granularity (such as a single geometric object) to coarse granularity (such as a map object interacted with an existing ARCMAP document) is very wide, and the objects integrate comprehensive geographic information system functions for developers. The sizes, positions and proportions of the two-stage aerial photos after the ARCGIS is cut are the same, so that the overlaying comparison processing is conveniently carried out at the later stage;
the forward orthographic photo refers to a historical photo in the same area subjected to orthographic processing.
The output of the aerial photo shooting unit is connected with the input end of the aerial photo orthographic unit, the output end of the aerial photo orthographic unit is connected with the input end of the aerial photo cutting unit, and the output end of the aerial photo cutting unit is connected with the input end of the elevation extraction module.
According to the technical scheme, the elevation conversion module comprises a data summarizing unit, a vector conversion unit and a data positioning unit;
the data summarizing unit is used for summarizing the elevation data extracted by the elevation extraction module and classifying the consistent elevation data into one type, the vector conversion unit is used for converting the summarized elevation data into vector data to realize the datamation and direction of comparison and enable the comparison to be more accurate, and the data positioning unit is used for positioning the vector data to a layer consistent with the position of an orthophoto to realize the correspondence between the elevation data and the vector data so as to facilitate the comparison of the two phases of the astronomical according to the vector layer;
the output end of the elevation extraction module is connected with the input end of the data summarizing unit, the output end of the data summarizing unit is connected with the input end of the vector conversion unit, the output end of the vector conversion unit is connected with the input end of the data positioning unit, and the output end of the data positioning unit is connected with the input end of the layer correction unit.
According to the technical scheme, the layer superposition module comprises a layer correction unit and a layer separation unit;
the layer correcting unit is used for correcting the superposition of the two-stage aerial films according to the vector data of the fixed point, so that the final comparison result is prevented from being wrong due to disorder of the superposition of the vector layers of the two-stage aerial films, the superposition processing of the vector layers of the two-stage aerial films before comparison is realized, the layer separating unit is used for separating the vector layers of the two-stage aerial films after superposition, the fixed point comparison of the vector layers of the two-stage aerial films is realized, and the comparison precision of the vector layers is improved;
and the output end of the layer correcting unit is connected with the input end of the layer separating unit.
According to the technical scheme, the comparison and labeling module comprises a layer comparison unit, a contour drawing unit and a layer labeling unit;
the map layer comparison unit is used for comparing vector data of map layers where two-phase aerial photographs are located after synchronous separation, so that the phenomenon that comparison errors occur due to comparison between vector map layers at different positions in the comparison process is avoided, the contour tracing unit is used for tracing contours of areas with different vector changes after the map layer comparison unit compares the contours, the specific overlooking appearance of illegal occupied land can be known more clearly, the illegal building can be preliminarily known, and the map layer marking unit is used for marking the areas with vector changes, so that the positions and areas where the illegal buildings are located can be known more clearly;
the output end of the layer separation unit is connected with the input end of the layer comparison unit, the output end of the layer comparison unit is connected with the input end of the outline description unit, and the output end of the outline description unit is connected with the input end of the layer labeling unit.
According to the technical scheme, the elevation data extracted by the elevation extraction module for the current voyage are H, the elevation data extracted by the elevation extraction module for the current voyage are I, when the elevation conversion module converts the elevation data, the data totaling unit sorts the elevation data in sequence and sums the data with the same elevation to form a set of the elevation data of the current voyage
And current aerial elevation data
Wherein, in the step (A),
respectively represent different elevation data of current voyage,
respectively representing different elevation data of the current flight, and the vector conversion unit collects the elevation data of the current flight
And current aerial elevation data
Converting into vector data to form current navigation sheet vector data set
And current navigation sheet vector data set
Wherein, in the step (A),
respectively representing corresponding current time flight film elevation data
The vector to be converted is then converted into a vector,
respectively representing corresponding current navigation sheet elevation data
The converted vector, the data positioning unit, and the vector
The vectors are positioned on the layer with the same size as the current navigation films after cutting, and the vectors are positioned by the data positioning unit
Positioned on a layer of the same size as the current aerial photo after cropping, the vector
The position of the positioning is consistent with the position of the corresponding elevation data on the current navigation plate, and the vector is
And the positioned position is consistent with the position of the corresponding elevation data on the current aerial, and an earlier aerial vector layer and a current aerial vector layer are respectively formed.
According to the technical scheme, when the layer superposition module superposes the vector layers of the two-phase aerial photographs, the layer correction unit selects the same vector values at the same positions on the two-phase aerial photographs as fixed points respectively, corrects the vector layers of the superposed two-phase aerial photographs, and selects the vector points at the same positions according to the following formula:
wherein the content of the first and second substances,
representing the vector difference between two vector points,
and
vectors respectively representing two vector points;
when in use
Then, the corresponding two-phase flight films are confirmed
And
is the first correction point;
when in use
Then, the corresponding two-phase flight films are confirmed
And
is the second correction point, where k ∈ (1, n), k ≠ i;
when in use
Then, the point is excluded as a correction point on the two-stage navigation film;
when the two correction points are confirmed, the layer correction unit superposes the vector layers of the two-stage aerial photos by using the two correction points, so that the superposed correction of the vector layers is realized, and the problem of later-stage comparison of the aerial photos caused by disorder of the vector layers in the superposing process is avoided.
According to the technical scheme, the layer separation unit separates the vector layers of the two phases of the aerial photos after the superposition according to the vector points, so that the vector layers after the superposition are separated into a plurality of comparison points, each comparison point comprises a vector value of the same position of the two phases of the aerial photos after the superposition of the vector layers, and the area corresponding to each comparison point is S.
According to the technical scheme, the comparison and labeling module compares and labels the two-stage aerial photos according to a plurality of separated vector layer comparison points, and the layer comparison unit compares two vector values of the two-stage aerial photo comparison points according to the following formula:
when in use
When the point is a vector value catastrophe point, the position of the point on the aerial photo is represented as an illegal building;
the outline drawing unit counts the vector value mutation points and draws the outline of the vector value mutation points in the same area, a closed space formed after drawing is the position of the illegal building, the number of comparison points in the closed space is P, the scale of the illegal building can be preliminarily confirmed according to the area S of the layer separated by the layer separating unit and the number P of the comparison points separated in the closed space, and the outline and the scale of the illegal building can be preliminarily judged through the outline of the drawn closed space;
the layer marking unit marks the colors of the outer contour drawn by the contour drawing unit on the vector diagram layer, and marks the outer contour with different colors according to the area of the outer contour, so that the position of the illegal building and the scale of the illegal building can be more clearly known.
DSM is a digital surface model, which is a ground elevation model that includes the height of surface buildings, bridges, trees, etc.
Compared with the prior art, the invention has the beneficial effects that:
1. the comparison efficiency is high, the method is suitable for large-scale aerial photograph patrol comparison, and the patrol comparison time and labor input are greatly shortened.
2. The accuracy of comparison is high, and the condition of omission is difficult to appear in automatic comparison, the existence of discovery violation of rules and regulations building that can be more accurate.
3. The comparison has stronger pertinence, and the buildings with different areas can be screened by adjusting the size of each numerical value.
4. The superposition on the vector layers is more accurate, and the two mutually superposed vector layers are corrected through the two correction points by searching the correction points, so that the superposition is more accurate, and the phenomenon that the superposition is mistaken to cause comparison and continuous errors is avoided.
5. The marking effect is obvious, through the picture layer partition unit and the outline drawing unit, the rough appearance of the illegal building can be drawn more accurately, the specific appearance and scale of the illegal building can be known more clearly, and the illegal building is marked through different colors, so that the marking effect on the illegal building is more obvious.
Drawings
FIG. 1 is a schematic diagram of the module composition of an automatic DSM comparison system based on aerial photography measurement according to the present invention;
FIG. 2 is a schematic diagram of module connections of an automatic DSM comparison system based on aerial measurements according to the present invention;
fig. 3 is a schematic processing flow diagram of an aerial photograph of the DSM automatic comparison system based on aerial photography measurement according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 3, a DSM automatic comparison system based on aerial photography measurement includes a aerial photo processing module, an elevation extraction module, an elevation conversion module, a layer superposition module and a comparison labeling module;
the aerial photo processing module is used for shooting, orthographically and cutting aerial photos, comparing and labeling the aerial photos by using an automatic comparison system in the later period of convenience, the elevation extraction module is used for extracting elevation data of two-period aerial photos after the aerial photo processing module processes, the elevation conversion module is used for converting the elevation data of the two-period aerial photos extracted by the elevation extraction module into vector image layers, the elevation data of the two-period ortho aerial photos are converted into the vector image layers through the elevation extraction module and the elevation conversion module, automatic comparison is carried out on the vector image layers, the comparison efficiency and the comparison precision are improved, the image layer superposition module is used for carrying out superposition processing on the vector image layers of the two-period aerial photos, fixed-point comparison of the two-period aerial photos is facilitated, the comparison accuracy is improved, the comparison and labeling module is used for labeling changed areas in the two-period aerial photo vector image layers, so that automatic labeling can be realized and the comparison efficiency is improved;
the output of aerial photo processing module is connected with the input of elevation extraction module, the output of elevation extraction module is connected with the input of elevation conversion module, the input of picture layer stack module is connected to the output of elevation conversion module, the input of comparison mark module is connected to the output of picture layer stack module.
The aerial photo processing module comprises an aerial photo shooting unit, an aerial photo orthographic unit and an aerial photo cutting unit;
the two-phase orthophoto shooting unit is an unmanned aerial vehicle and a orthophoto camera, the two-phase orthophoto shooting unit shoots the orthophotos needing to be compared, and is convenient to automatically compare the orthophotos with the antecedent radiographs in the past period;
the output of the aerial photo shooting unit is connected with the input end of the aerial photo orthographic unit, the output end of the aerial photo orthographic unit is connected with the input end of the aerial photo cutting unit, and the output end of the aerial photo cutting unit is connected with the input end of the elevation extraction module.
The elevation conversion module comprises a data summarizing unit, a vector conversion unit and a data positioning unit;
the data summarizing unit is used for summarizing the elevation data extracted by the elevation extraction module and classifying the consistent elevation data into one type, the vector conversion unit is used for converting the summarized elevation data into vector data to realize the datamation and direction of comparison and enable the comparison to be more accurate, and the data positioning unit is used for positioning the vector data to a layer consistent with the position of an orthophoto to realize the correspondence between the elevation data and the vector data so as to facilitate the comparison of the two phases of the astronomical according to the vector layer;
the output end of the elevation extraction module is connected with the input end of the data summarizing unit, the output end of the data summarizing unit is connected with the input end of the vector conversion unit, the output end of the vector conversion unit is connected with the input end of the data positioning unit, and the output end of the data positioning unit is connected with the input end of the layer correction unit.
The layer superposition module comprises a layer correction unit and a layer separation unit;
the layer correcting unit is used for correcting the superposition of the two-stage aerial films according to the vector data of the fixed point, so that the final comparison result is prevented from being wrong due to disorder of the superposition of the vector layers of the two-stage aerial films, the superposition processing of the vector layers of the two-stage aerial films before comparison is realized, the layer separating unit is used for separating the vector layers of the two-stage aerial films after superposition, the fixed point comparison of the vector layers of the two-stage aerial films is realized, and the comparison precision of the vector layers is improved;
and the output end of the layer correcting unit is connected with the input end of the layer separating unit.
The comparison and labeling module comprises a layer comparison unit, a contour drawing unit and a layer labeling unit;
the map layer comparison unit is used for comparing vector data of map layers where two-phase aerial photographs are located after synchronous separation, so that the phenomenon that comparison errors occur due to comparison between vector map layers at different positions in the comparison process is avoided, the contour tracing unit is used for tracing contours of areas with different vector changes after the map layer comparison unit compares the contours, the specific overlooking appearance of illegal occupied land can be known more clearly, the illegal building can be preliminarily known, and the map layer marking unit is used for marking the areas with vector changes, so that the positions and areas where the illegal buildings are located can be known more clearly;
the output end of the layer separation unit is connected with the input end of the layer comparison unit, the output end of the layer comparison unit is connected with the input end of the outline description unit, and the output end of the outline description unit is connected with the input end of the layer labeling unit.
The elevation data extracted by the elevation extraction module for the current voyage are H, the elevation data extracted by the elevation extraction module for the current voyage are I, when the elevation conversion module converts the elevation data, the data summarization unit sorts the elevation data in sequence and summarizes the data with the same elevation to form a set of the altitude data of the current voyage
And current aerial elevation data
Wherein, in the step (A),
respectively represent different elevation data of current voyage,
respectively representing different elevation data of the current flight films, and the vector conversion unit collects the elevation data of the current flight films
And current aerial elevation data
Converting into vector data to form current navigation sheet vector data set
And current navigation sheet vector data set
Wherein, in the step (A),
respectively representing corresponding current time flight film elevation data
The vector to be converted is then converted into a vector,
respectively representing corresponding current navigation sheet elevation data
The converted vector, the data positioning unit, and the vector
The vectors are positioned on the layer with the same size as the current navigation films after cutting, and the vectors are positioned by the data positioning unit
Positioned on a layer of the same size as the current aerial photo after cropping, the vector
The position of the positioning is consistent with the position of the corresponding elevation data on the current navigation plate, and the vector is
And the positioned position is consistent with the position of the corresponding elevation data on the current aerial, and an earlier aerial vector layer and a current aerial vector layer are respectively formed.
When the layer superposition module is used for superposing the vector layers of the two-phase navigation films, the layer correction unit selects the same vector values at the same positions on the two-phase navigation films as fixed points respectively, corrects the superposed vector layers of the two-phase navigation films, and selects the vector points at the same positions according to the following formula:
wherein the content of the first and second substances,
representing the vector difference between two vector points,
and
vectors respectively representing two vector points;
when in use
Then, the corresponding two-phase flight films are confirmed
And
is the first correction point;
when in use
Then, the corresponding two-phase flight films are confirmed
And
is the second correction point, where k ∈ (1, n), k ≠ i;
when in use
Then, the point is excluded as a correction point on the two-stage navigation film;
when the two correction points are confirmed, the layer correction unit superposes the vector layers of the two-stage aerial photos by using the two correction points, so that the superposed correction of the vector layers is realized, and the problem of later-stage comparison of the aerial photos caused by disorder of the vector layers in the superposing process is avoided.
The layer separation unit separates the vector layers of the two-phase aerial photographs after being superposed according to the vector points, so that the vector layers after being superposed are separated into a plurality of comparison points, each comparison point comprises a vector value at the same position of the two-phase aerial photographs after being superposed, and the area corresponding to each comparison point is S.
The comparison and labeling module compares and labels the two-phase aerial photographs according to a plurality of separated vector layer comparison points, and the layer comparison unit compares two vector values of the two-phase aerial photograph comparison points according to the following formula:
when in use
When the point is a vector value catastrophe point, the position of the point on the aerial photo is represented as an illegal building;
the outline drawing unit counts the vector value mutation points and draws the outline of the vector value mutation points in the same area, a closed space formed after drawing is the position of the illegal building, the number of comparison points in the closed space is P, the scale of the illegal building can be preliminarily confirmed according to the area S of the layer separated by the layer separating unit and the number P of the comparison points separated in the closed space, and the outline and the scale of the illegal building can be preliminarily judged through the outline of the drawn closed space;
the layer marking unit marks the colors of the outer contour drawn by the contour drawing unit on the vector diagram layer, and marks the outer contour with different colors according to the area of the outer contour, so that the position of the illegal building and the scale of the illegal building can be more clearly known.
Example (b):
the elevation data extracted by the elevation extraction module for the current voyage are H, the elevation data extracted by the elevation extraction module for the current voyage are I, when the elevation conversion module converts the elevation data, the data summarization unit sorts the elevation data in sequence and summarizes the data with the same elevation to form a set of the altitude data of the current voyage
And current aerial elevation data
The vector conversion unit collects the current-period aerial photo elevation data
And current aerial elevation data
Converting into vector data to form current navigation sheet vector data set
And current navigation sheet vector data set
The data positioning unit is used for positioning the vector
The vectors are positioned on the layer with the same size as the current navigation films after cutting, and the vectors are positioned by the data positioning unit
Positioned on a layer of the same size as the current aerial photo after cropping, the vector
The position of the positioning is consistent with the position of the corresponding elevation data on the current navigation plate, and the vector is
And the positioned position is consistent with the position of the corresponding elevation data on the current aerial, and an earlier aerial vector layer and a current aerial vector layer are respectively formed.
When the layer superposition module is used for superposing the vector layers of the two-phase navigation films, the layer correction unit selects the same vector values at the same positions on the two-phase navigation films as fixed points respectively, corrects the superposed vector layers of the two-phase navigation films, and selects the vector points at the same positions according to the following formula:
identifying corresponding two-phase flight films
And
is the first correction point;
identifying corresponding two-phase flight films
And
is the second correction point;
when the two correction points are confirmed, the layer correction unit superposes the vector layers of the two-stage aerial photos by using the two correction points, so that the superposed correction of the vector layers is realized, and the problem of later-stage comparison of the aerial photos caused by disorder of the vector layers in the superposing process is avoided.
The layer separation unit separates the vector layers of the two-phase aerial photographs after being superposed according to the vector points, so that the vector layers after being superposed are separated into a plurality of comparison points, each comparison point comprises a vector value at the same position of the two-phase aerial photographs after being superposed, and the area corresponding to each comparison point is S.
The comparison and labeling module compares and labels the two-phase aerial photographs according to a plurality of separated vector layer comparison points, and the layer comparison unit compares two vector values of the two-phase aerial photograph comparison points according to the following formula:
the 9 points are indicated as vector value catastrophe points, and illegal buildings appear at the positions of the 9 points on the aerial photos;
the contour drawing unit counts the vector value mutation points and draws the contour of the vector value mutation points in the same region, a closed space formed after drawing is the position of the illegal building, the number of comparison points in the closed space is 9, and the area S =1m of the layer separated by the layer separation unit2And 9 comparison points are separated in the closed space, so that the area of the illegal building can be preliminarily confirmed to be 9m2；
The layer labeling unit performs color labeling on the outer contour depicted by the contour depicting unit on a vector diagram layer, so that the position of the illegal building and the scale of the illegal building can be more clearly known.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. An automatic DSM comparison system based on aerial photography measurement is characterized in that: the system comprises a navigation sheet processing module, an elevation extraction module, an elevation conversion module, a layer superposition module and a comparison and labeling module;
the device comprises a aerial photo processing module, an elevation conversion module, a map layer superposition module, a comparison marking module and a data processing module, wherein the aerial photo processing module is used for shooting, orthographically projecting and cutting aerial photos, the elevation extraction module is used for extracting elevation data of the two-stage aerial photos processed by the aerial photo processing module, the elevation conversion module is used for converting the elevation data of the two-stage aerial photos extracted by the elevation extraction module into vector map layers, the map layer superposition module is used for superposing the vector map layers of the two-stage aerial photos, and the comparison marking module is used for marking areas with changes in the vector map layers of the two-stage aerial photos;
the output end of the aerial photo processing module is connected with the input end of the elevation extraction module, the output end of the elevation extraction module is connected with the input end of the elevation conversion module, the output end of the elevation conversion module is connected with the input end of the image layer superposition module, and the output end of the image layer superposition module is connected with the input end of the comparison marking module;
the aerial photo processing module comprises an aerial photo shooting unit, an aerial photo orthographic unit and an aerial photo cutting unit;
the aerial photo shooting unit is an unmanned aerial vehicle and an aerial photo camera and is used for shooting aerial photos needing to be compared, the aerial photo orthographic unit is used for performing orthographic correction processing on the shot aerial photos, the aerial photo cutting unit is used for cutting the aerial photos after the orthographic correction processing and the forward-phase orthographic aerial photos by using the ARCGIS, and the two phases of aerial photos after the ARCGIS is cut are identical in size, position and proportion;
the output end of the aerial photo shooting unit is connected with the input end of the aerial photo orthographic unit, the output end of the aerial photo orthographic unit is connected with the input end of the aerial photo cutting unit, and the output end of the aerial photo cutting unit is connected with the input end of the elevation extraction module;
the elevation conversion module comprises a data summarizing unit, a vector conversion unit and a data positioning unit;
the data summarizing unit is used for summarizing the elevation data extracted by the elevation extraction module and classifying the consistent elevation data into one class, the vector conversion unit is used for converting the summarized elevation data into vector data, and the data positioning unit is used for positioning the vector data onto a layer consistent with the position of an orthophoto so as to realize the correspondence between the elevation data and the vector data;
the output end of the elevation extraction module is connected with the input end of a data summarizing unit, the output end of the data summarizing unit is connected with the input end of a vector conversion unit, the output end of the vector conversion unit is connected with the input end of a data positioning unit, and the output end of the data positioning unit is connected with the input end of a layer correction unit;
the layer superposition module comprises a layer correction unit and a layer separation unit;
the layer correcting unit is used for correcting the superposition of the two-stage navigation films according to the vector data of the fixed point, and the layer separating unit is used for separating the vector layers of the two-stage navigation films after superposition;
the output end of the layer correcting unit is connected with the input end of the layer separating unit;
when the layer superposition module is used for superposing the vector layers of the two-phase navigation films, the layer correction unit selects the same vector values at the same positions on the two-phase navigation films as fixed points respectively, corrects the superposed vector layers of the two-phase navigation films, and selects the vector points at the same positions according to the following formula:
wherein the content of the first and second substances,
representing the vector difference between two vector points,
and
vectors respectively representing two vector points;
when in use
Then, the corresponding two-phase flight films are confirmed
And
is the first correction point;
when in use
Then, the corresponding two-phase flight films are confirmed
And
is the second correction point, where k ∈ (1, n), k ≠ i;
when in use
Then, the point is excluded as a correction point on the two-stage navigation film;
when the two correction points are confirmed, the layer correction unit superposes the vector layers of the two-phase aerial photos by using the two correction points, so that the superposition correction of the vector layers is realized.
2. The system according to claim 1, wherein the DSM automatic alignment system based on aerial photography measurement comprises: the comparison and labeling module comprises a layer comparison unit, a contour drawing unit and a layer labeling unit;
the image layer comparison unit is used for comparing vector data of image layers where the two-phase aerial photographs are located after synchronous separation, the contour drawing unit is used for drawing contours of areas with different vector changes after the image layer comparison unit compares the contours, and the image layer labeling unit is used for labeling the areas with the vector changes;
the output end of the layer separation unit is connected with the input end of the layer comparison unit, the output end of the layer comparison unit is connected with the input end of the outline description unit, and the output end of the outline description unit is connected with the input end of the layer labeling unit.
3. The system according to claim 2, wherein the DSM automatic alignment system based on aerial photography measurement is: the elevation data extracted by the elevation extraction module for the current voyage are H, the elevation data extracted by the elevation extraction module for the current voyage are I, when the elevation conversion module converts the elevation data, the data summarization unit sorts the elevation data in sequence and summarizes the data with the same elevation to form a set of the altitude data of the current voyage
And current aerial elevation data
Wherein, in the step (A),
respectively represent different elevation data of current voyage,
respectively representing different elevation data of the current flight films, and the vector conversion unit collects the elevation data of the current flight films
And current aerial elevation data
Converting into vector data to form current navigation sheet vector data set
And current navigation sheet vector data set
Wherein, in the step (A),
respectively representing corresponding current time flight film elevation data
The vector to be converted is then converted into a vector,
respectively representing corresponding current navigation sheet elevation data
The converted vector, the data positioning unit, and the vector
The vectors are positioned on the layer with the same size as the current navigation films after cutting, and the vectors are positioned by the data positioning unit
After positioning and cuttingOn the layer with the same size as the front aerial photo, the vector
The position of the positioning is consistent with the position of the corresponding elevation data on the current navigation plate, and the vector is
And the positioned position is consistent with the position of the corresponding elevation data on the current aerial, and an earlier aerial vector layer and a current aerial vector layer are respectively formed.
4. The system according to claim 3, wherein the DSM automatic comparison system based on aerial photography measurement comprises: the layer separation unit separates the vector layers of the two-phase aerial photographs after being superposed according to the vector points, so that the vector layers after being superposed are separated into a plurality of comparison points, each comparison point comprises a vector value at the same position of the two-phase aerial photographs after being superposed, and the area corresponding to each comparison point is S.
5. The system according to claim 4, wherein the DSM automatic comparison system based on aerial photography measurement comprises: the comparison and labeling module compares and labels the two-phase aerial photographs according to a plurality of separated vector layer comparison points, and the layer comparison unit compares two vector values of the two-phase aerial photograph comparison points according to the following formula:
when in use
When the point is a vector value catastrophe point, the position of the point on the aerial photo is represented as an illegal building;
the outline drawing unit counts the vector value mutation points and draws the outline of the vector value mutation points in the same area, a closed space formed after drawing is the position of the illegal building, the number of comparison points in the closed space is P, the scale of the illegal building can be preliminarily confirmed according to the area S of the layer separated by the layer separating unit and the number P of the comparison points separated in the closed space, and the outline and the scale of the illegal building can be preliminarily judged through the outline of the drawn closed space;
and the layer marking unit marks the colors of the outer contour drawn by the contour drawing unit on the vector diagram layer, and marks the outer contour with different colors according to the area of the outer contour.
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